RR does not allow phantom reads by creating an S (share) table lock when selecting rows.
RR不允许幻象读取，它会在选择行时创建一个S（share）表锁定。
An unrepeatable read, phantom read, and reads of uncommitted data can occur.
会发生不可重读、幻像读和读未提交数据。
An unrepeatable read, phantom read, and reads of uncommitted data can occur.
会发生不可重读、幻像读和读未提交数据。
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